34 lines
1.0 KiB
Zig
34 lines
1.0 KiB
Zig
const builtin = @import("builtin");
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const AtomicOrder = builtin.AtomicOrder;
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/// Thread-safe, lock-free integer
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pub fn Int(comptime T: type) type {
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return struct {
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unprotected_value: T,
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pub const Self = @This();
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pub fn init(init_val: T) Self {
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return Self{ .unprotected_value = init_val };
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}
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/// Returns previous value
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pub fn incr(self: *Self) T {
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return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Add, 1, AtomicOrder.SeqCst);
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}
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/// Returns previous value
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pub fn decr(self: *Self) T {
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return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Sub, 1, AtomicOrder.SeqCst);
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}
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pub fn get(self: *Self) T {
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return @atomicLoad(T, &self.unprotected_value, AtomicOrder.SeqCst);
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}
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pub fn xchg(self: *Self, new_value: T) T {
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return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Xchg, new_value, AtomicOrder.SeqCst);
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}
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};
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}
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